Nigel had also really shown an interest in Harry Potter (who was dubbed 'The Boy who Lived'), and had asked Ron Weasley if he could get him Harry's autograph. Nigel was seen as a supporting member to Harry Potter throughout the Triwizard Tournament and was often bullied by Draco Malfoy and his crew for doing so. For instance, when Nigel was cheering for Harry after he emerged from the lakeDraco hit Nigel over the head and pulled his hat down over his face. Also during this year, despite being only a first year, Nigel attended the Yule Ball, meaning he must have been asked by someone much older than him, as Ginny Weasley, a third year, accepted Neville Longbottom's offer as she doubted she'd be asked by anyone else and being so young she wouldn't have been allowed to attend otherwise.

When attending the D.A.'s meetings Nigel would often stay close to Harry Potter, whom he looked up to. With Nigel's enthusiasm in lessons Harry would often use Nigel as a 'test dummy' and was used to demonstrate performing the Stunning Spell. He also assisted Harry by acting as a look-out as the students left the Room of Requirement at the end of the meetings. When Dolores Umbridge and her Inquisitorial Squad discovered the D.A. meetings, Nigel was at the front of the class along with Harry. He was among the students to serve one of Umbridge's 'medieval' detentions as punishment for being a member of Dumbledore's Army. Towards the end of the year Fred and George Weasley put their plans of escape into action and Nigel was amongst the crowd of students and staff to witness their departure and cheered them off after they turned a school corridor into a swamp.[6]

Third year (1996-1997)

During Nigel's third year his idol Harry Potter became the new Captain for the Gryffindor Quidditch team. Nigel was present at the Quidditch tryouts that year but did not make the team, however he did not take the news badly and was quite happy with the selected students as he was later shown to be very supportive. Nigel was seen cheering loudly for Ron Weasley when he won his first Quidditch match. He also witnessed Ron and Lavender Brown passionately kissing for the first time in the Gryffindor common room, something which he showed disgust in by poking his tongue out and covering his face with his woolly hat to block his view. Being Nigel's third year, this year would have been the first time he was able to go out on a trip to Hogsmeade during the weekends, assuming he was given parental consent.

Nigel was also still present at Hogwarts when ProfessorSeverus Snape killed the school's current headmasterAlbus Dumbledore. After hearing the news and seeing the Dark Mark floating above the school he and a large group of students and staff gathered around Dumbledore's body, which had fallen from the Astronomy Tower, Nigel arrived at the place with Luna Lovegood and stood with her and Madam Pomfrey whilst the crowd looked on at Harry who had crouched down to Dumbledore. When the time came, he followed Professor McGonagall's sign of respect and lit his wand and raised his arm in the air with the crowd of students to show their respects to the late headmaster, in doing so the combined faculty and students of Hogwarts managed to rid the sky of the over-looking Dark Mark. It is more than likely that Nigel attended the funeral service that followed afterwards unless his parents pulled him out of school before the year had finished, like some others had done.[7]

Fourth year and Battle of Hogwarts (1997-1998)

Nigel (on the right) with D.A. members defending the Wooden Bridge during the Battle.

In Nigel's fourth year, he was still at Hogwarts, and was a member of Dumbledore's Army, as he was seen greeting Harry when he arrived in the Room of Requirement prior to the Battle of Hogwarts, and also served as a communicator to members of the Order of the Phoenix. Nigel participated the battle alongside his friends against the Death Eaters.

Duelling: Despite his young age, Nigel was a skilled duellist, Nigel defeated many Death Eaters alongside with his friends during the Battle of Hogwarts.

Etymology

"Nigel" is derived from the Latin "Nigellus".

The name Nigel also has Scottish origin in which it means "Champion".

The name Wolpert means "descendent of Waldobert"[8]. "Waldobert" is a Germanic name composed of the elements "wald", meaning "rule", and "beraht", meaning "bright". It was the name of a 7th-century French saint.[9]

It is possible, given the similarities in appearance and role (in Order of the Phoenix with Dumbledore's Army and again with his death in Deathly Hallows), that Nigel was meant to replace Colin Creevey for the movies.

In the film adaptation of Harry Potter and the Order of the Phoenix, Nigel attends the first meeting of what would become Dumbledore's Army in the Hog's Head.

William Melling has a non-speaking role in the sixth film and he is shown several times in the background. He originally was present in the bathroom during Draco Malfoy and Harry Potter's duel, but he was later cut from this scene.[10]

Storyboards for the film adaptation of Harry Potter and the Order of the Phoenix drawn by Nick Pelham consistently refer to Nigel as "Philip". Whether a different character was originally intended for this scene, Nigel was going to be renamed, or this was simply an error on the artist's part is unclear.[11]